Synonyms for Archean Eon (same or very similar meaning)
WordNet sense 1 (the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life):
Archaeozoic, archean, archeozoic, Archaeozoic aeon, Archean aeon, Archeozoic eonFrom the ODE community, based on WordNetadd/edit